| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 |
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| 4 | generalised event loop handling
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| 5 |
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| 6 | Copyright (C) Andrew Tridgell 2005
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| 7 | Copyright (C) Stefan Metzmacher 2005-2009
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| 8 | Copyright (C) Volker Lendecke 2008
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| 9 |
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| 10 | ** NOTE! The following LGPL license applies to the tevent
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| 11 | ** library. This does NOT imply that all of Samba is released
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| 12 | ** under the LGPL
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| 13 |
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| 14 | This library is free software; you can redistribute it and/or
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| 15 | modify it under the terms of the GNU Lesser General Public
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| 16 | License as published by the Free Software Foundation; either
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| 17 | version 3 of the License, or (at your option) any later version.
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| 18 |
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| 19 | This library is distributed in the hope that it will be useful,
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| 20 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 22 | Lesser General Public License for more details.
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| 23 |
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| 24 | You should have received a copy of the GNU Lesser General Public
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| 25 | License along with this library; if not, see <http://www.gnu.org/licenses/>.
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| 26 | */
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| 27 |
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| 28 | #ifndef __TEVENT_H__
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| 29 | #define __TEVENT_H__
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| 30 |
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| 31 | #include <stdint.h>
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| 32 | #include <talloc.h>
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| 33 | #include <sys/time.h>
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| 34 | #include <stdbool.h>
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| 35 |
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| 36 | struct tevent_context;
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| 37 | struct tevent_ops;
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| 38 | struct tevent_fd;
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| 39 | struct tevent_timer;
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| 40 | struct tevent_immediate;
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| 41 | struct tevent_signal;
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| 42 |
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| 43 | /* event handler types */
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| 44 | typedef void (*tevent_fd_handler_t)(struct tevent_context *ev,
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| 45 | struct tevent_fd *fde,
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| 46 | uint16_t flags,
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| 47 | void *private_data);
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| 48 | typedef void (*tevent_fd_close_fn_t)(struct tevent_context *ev,
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| 49 | struct tevent_fd *fde,
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| 50 | int fd,
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| 51 | void *private_data);
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| 52 | typedef void (*tevent_timer_handler_t)(struct tevent_context *ev,
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| 53 | struct tevent_timer *te,
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| 54 | struct timeval current_time,
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| 55 | void *private_data);
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| 56 | typedef void (*tevent_immediate_handler_t)(struct tevent_context *ctx,
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| 57 | struct tevent_immediate *im,
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| 58 | void *private_data);
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| 59 | typedef void (*tevent_signal_handler_t)(struct tevent_context *ev,
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| 60 | struct tevent_signal *se,
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| 61 | int signum,
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| 62 | int count,
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| 63 | void *siginfo,
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| 64 | void *private_data);
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| 65 |
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| 66 | struct tevent_context *tevent_context_init(TALLOC_CTX *mem_ctx);
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| 67 | struct tevent_context *tevent_context_init_byname(TALLOC_CTX *mem_ctx, const char *name);
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| 68 | const char **tevent_backend_list(TALLOC_CTX *mem_ctx);
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| 69 | void tevent_set_default_backend(const char *backend);
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| 70 |
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| 71 | struct tevent_fd *_tevent_add_fd(struct tevent_context *ev,
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| 72 | TALLOC_CTX *mem_ctx,
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| 73 | int fd,
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| 74 | uint16_t flags,
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| 75 | tevent_fd_handler_t handler,
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| 76 | void *private_data,
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| 77 | const char *handler_name,
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| 78 | const char *location);
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| 79 | #define tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data) \
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| 80 | _tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data, \
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| 81 | #handler, __location__)
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| 82 |
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| 83 | struct tevent_timer *_tevent_add_timer(struct tevent_context *ev,
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| 84 | TALLOC_CTX *mem_ctx,
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| 85 | struct timeval next_event,
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| 86 | tevent_timer_handler_t handler,
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| 87 | void *private_data,
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| 88 | const char *handler_name,
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| 89 | const char *location);
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| 90 | #define tevent_add_timer(ev, mem_ctx, next_event, handler, private_data) \
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| 91 | _tevent_add_timer(ev, mem_ctx, next_event, handler, private_data, \
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| 92 | #handler, __location__)
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| 93 |
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| 94 | struct tevent_immediate *_tevent_create_immediate(TALLOC_CTX *mem_ctx,
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| 95 | const char *location);
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| 96 | #define tevent_create_immediate(mem_ctx) \
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| 97 | _tevent_create_immediate(mem_ctx, __location__)
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| 98 |
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| 99 | void _tevent_schedule_immediate(struct tevent_immediate *im,
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| 100 | struct tevent_context *ctx,
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| 101 | tevent_immediate_handler_t handler,
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| 102 | void *private_data,
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| 103 | const char *handler_name,
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| 104 | const char *location);
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| 105 | #define tevent_schedule_immediate(im, ctx, handler, private_data) \
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| 106 | _tevent_schedule_immediate(im, ctx, handler, private_data, \
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| 107 | #handler, __location__);
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| 108 |
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| 109 | struct tevent_signal *_tevent_add_signal(struct tevent_context *ev,
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| 110 | TALLOC_CTX *mem_ctx,
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| 111 | int signum,
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| 112 | int sa_flags,
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| 113 | tevent_signal_handler_t handler,
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| 114 | void *private_data,
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| 115 | const char *handler_name,
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| 116 | const char *location);
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| 117 | #define tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data) \
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| 118 | _tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data, \
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| 119 | #handler, __location__)
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| 120 |
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| 121 | int _tevent_loop_once(struct tevent_context *ev, const char *location);
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| 122 | #define tevent_loop_once(ev) \
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| 123 | _tevent_loop_once(ev, __location__) \
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| 124 |
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| 125 | int _tevent_loop_wait(struct tevent_context *ev, const char *location);
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| 126 | #define tevent_loop_wait(ev) \
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| 127 | _tevent_loop_wait(ev, __location__) \
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| 128 |
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| 129 | void tevent_fd_set_close_fn(struct tevent_fd *fde,
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| 130 | tevent_fd_close_fn_t close_fn);
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| 131 | void tevent_fd_set_auto_close(struct tevent_fd *fde);
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| 132 | uint16_t tevent_fd_get_flags(struct tevent_fd *fde);
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| 133 | void tevent_fd_set_flags(struct tevent_fd *fde, uint16_t flags);
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| 134 |
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| 135 | bool tevent_signal_support(struct tevent_context *ev);
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| 136 |
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| 137 | void tevent_set_abort_fn(void (*abort_fn)(const char *reason));
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| 138 |
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| 139 | /* bits for file descriptor event flags */
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| 140 | #define TEVENT_FD_READ 1
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| 141 | #define TEVENT_FD_WRITE 2
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| 142 |
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| 143 | #define TEVENT_FD_WRITEABLE(fde) \
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| 144 | tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) | TEVENT_FD_WRITE)
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| 145 | #define TEVENT_FD_READABLE(fde) \
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| 146 | tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) | TEVENT_FD_READ)
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| 147 |
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| 148 | #define TEVENT_FD_NOT_WRITEABLE(fde) \
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| 149 | tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) & ~TEVENT_FD_WRITE)
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| 150 | #define TEVENT_FD_NOT_READABLE(fde) \
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| 151 | tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) & ~TEVENT_FD_READ)
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| 152 |
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| 153 | /* DEBUG */
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| 154 | enum tevent_debug_level {
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| 155 | TEVENT_DEBUG_FATAL,
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| 156 | TEVENT_DEBUG_ERROR,
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| 157 | TEVENT_DEBUG_WARNING,
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| 158 | TEVENT_DEBUG_TRACE
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| 159 | };
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| 160 |
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| 161 | int tevent_set_debug(struct tevent_context *ev,
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| 162 | void (*debug)(void *context,
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| 163 | enum tevent_debug_level level,
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| 164 | const char *fmt,
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| 165 | va_list ap) PRINTF_ATTRIBUTE(3,0),
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| 166 | void *context);
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| 167 | int tevent_set_debug_stderr(struct tevent_context *ev);
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| 168 |
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| 169 | /**
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| 170 | * An async request moves between the following 4 states:
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| 171 | */
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| 172 | enum tevent_req_state {
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| 173 | /**
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| 174 | * we are creating the request
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| 175 | */
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| 176 | TEVENT_REQ_INIT,
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| 177 | /**
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| 178 | * we are waiting the request to complete
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| 179 | */
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| 180 | TEVENT_REQ_IN_PROGRESS,
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| 181 | /**
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| 182 | * the request is finished
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| 183 | */
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| 184 | TEVENT_REQ_DONE,
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| 185 | /**
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| 186 | * A user error has occured
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| 187 | */
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| 188 | TEVENT_REQ_USER_ERROR,
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| 189 | /**
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| 190 | * Request timed out
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| 191 | */
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| 192 | TEVENT_REQ_TIMED_OUT,
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| 193 | /**
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| 194 | * No memory in between
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| 195 | */
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| 196 | TEVENT_REQ_NO_MEMORY,
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| 197 | /**
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| 198 | * the request is already received by the caller
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| 199 | */
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| 200 | TEVENT_REQ_RECEIVED
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| 201 | };
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| 202 |
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| 203 | /**
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| 204 | * @brief An async request
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| 205 | *
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| 206 | * This represents an async request being processed by callbacks via an event
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| 207 | * context. A user can issue for example a write request to a socket, giving
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| 208 | * an implementation function the fd, the buffer and the number of bytes to
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| 209 | * transfer. The function issuing the request will immediately return without
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| 210 | * blocking most likely without having sent anything. The API user then fills
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| 211 | * in req->async.fn and req->async.private_data, functions that are called
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| 212 | * when the request is finished.
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| 213 | *
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| 214 | * It is up to the user of the async request to talloc_free it after it has
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| 215 | * finished. This can happen while the completion function is called.
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| 216 | */
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| 217 |
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| 218 | struct tevent_req;
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| 219 |
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| 220 | typedef void (*tevent_req_fn)(struct tevent_req *);
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| 221 |
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| 222 | void tevent_req_set_callback(struct tevent_req *req, tevent_req_fn fn, void *pvt);
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| 223 | void *_tevent_req_callback_data(struct tevent_req *req);
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| 224 | void *_tevent_req_data(struct tevent_req *req);
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| 225 |
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| 226 | #define tevent_req_callback_data(_req, _type) \
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| 227 | talloc_get_type_abort(_tevent_req_callback_data(_req), _type)
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| 228 | #define tevent_req_callback_data_void(_req) \
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| 229 | _tevent_req_callback_data(_req)
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| 230 | #define tevent_req_data(_req, _type) \
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| 231 | talloc_get_type_abort(_tevent_req_data(_req), _type)
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| 232 |
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| 233 | typedef char *(*tevent_req_print_fn)(struct tevent_req *, TALLOC_CTX *);
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| 234 |
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| 235 | void tevent_req_set_print_fn(struct tevent_req *req, tevent_req_print_fn fn);
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| 236 |
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| 237 | char *tevent_req_default_print(struct tevent_req *req, TALLOC_CTX *mem_ctx);
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| 238 |
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| 239 | char *tevent_req_print(TALLOC_CTX *mem_ctx, struct tevent_req *req);
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| 240 |
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| 241 | typedef bool (*tevent_req_cancel_fn)(struct tevent_req *);
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| 242 |
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| 243 | void tevent_req_set_cancel_fn(struct tevent_req *req, tevent_req_cancel_fn fn);
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| 244 |
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| 245 | bool _tevent_req_cancel(struct tevent_req *req, const char *location);
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| 246 | #define tevent_req_cancel(req) \
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| 247 | _tevent_req_cancel(req, __location__)
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| 248 |
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| 249 | struct tevent_req *_tevent_req_create(TALLOC_CTX *mem_ctx,
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| 250 | void *pstate,
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| 251 | size_t state_size,
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| 252 | const char *type,
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| 253 | const char *location);
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| 254 |
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| 255 | #define tevent_req_create(_mem_ctx, _pstate, _type) \
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| 256 | _tevent_req_create((_mem_ctx), (_pstate), sizeof(_type), \
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| 257 | #_type, __location__)
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| 258 |
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| 259 | bool tevent_req_set_endtime(struct tevent_req *req,
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| 260 | struct tevent_context *ev,
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| 261 | struct timeval endtime);
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| 262 |
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| 263 | void _tevent_req_notify_callback(struct tevent_req *req, const char *location);
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| 264 | #define tevent_req_notify_callback(req) \
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| 265 | _tevent_req_notify_callback(req, __location__)
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| 266 |
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| 267 | void _tevent_req_done(struct tevent_req *req,
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| 268 | const char *location);
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| 269 | #define tevent_req_done(req) \
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| 270 | _tevent_req_done(req, __location__)
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| 271 |
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| 272 | bool _tevent_req_error(struct tevent_req *req,
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| 273 | uint64_t error,
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| 274 | const char *location);
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| 275 | #define tevent_req_error(req, error) \
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| 276 | _tevent_req_error(req, error, __location__)
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| 277 |
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| 278 | bool _tevent_req_nomem(const void *p,
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| 279 | struct tevent_req *req,
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| 280 | const char *location);
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| 281 | #define tevent_req_nomem(p, req) \
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| 282 | _tevent_req_nomem(p, req, __location__)
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| 283 |
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| 284 | struct tevent_req *tevent_req_post(struct tevent_req *req,
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| 285 | struct tevent_context *ev);
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| 286 |
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| 287 | bool tevent_req_is_in_progress(struct tevent_req *req);
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| 288 |
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| 289 | bool tevent_req_poll(struct tevent_req *req,
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| 290 | struct tevent_context *ev);
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| 291 |
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| 292 | bool tevent_req_is_error(struct tevent_req *req,
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| 293 | enum tevent_req_state *state,
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| 294 | uint64_t *error);
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| 295 |
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| 296 | void tevent_req_received(struct tevent_req *req);
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| 297 |
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| 298 | struct tevent_req *tevent_wakeup_send(TALLOC_CTX *mem_ctx,
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| 299 | struct tevent_context *ev,
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| 300 | struct timeval wakeup_time);
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| 301 | bool tevent_wakeup_recv(struct tevent_req *req);
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| 302 |
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| 303 | int tevent_timeval_compare(const struct timeval *tv1,
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| 304 | const struct timeval *tv2);
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| 305 |
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| 306 | struct timeval tevent_timeval_zero(void);
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| 307 |
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| 308 | struct timeval tevent_timeval_current(void);
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| 309 |
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| 310 | struct timeval tevent_timeval_set(uint32_t secs, uint32_t usecs);
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| 311 |
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| 312 | struct timeval tevent_timeval_until(const struct timeval *tv1,
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| 313 | const struct timeval *tv2);
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| 314 |
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| 315 | bool tevent_timeval_is_zero(const struct timeval *tv);
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| 316 |
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| 317 | struct timeval tevent_timeval_add(const struct timeval *tv, uint32_t secs,
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| 318 | uint32_t usecs);
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| 319 |
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| 320 | struct timeval tevent_timeval_current_ofs(uint32_t secs, uint32_t usecs);
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| 321 |
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| 322 | struct tevent_queue;
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| 323 |
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| 324 | struct tevent_queue *_tevent_queue_create(TALLOC_CTX *mem_ctx,
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| 325 | const char *name,
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| 326 | const char *location);
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| 327 |
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| 328 | #define tevent_queue_create(_mem_ctx, _name) \
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| 329 | _tevent_queue_create((_mem_ctx), (_name), __location__)
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| 330 |
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| 331 | typedef void (*tevent_queue_trigger_fn_t)(struct tevent_req *req,
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| 332 | void *private_data);
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| 333 | bool tevent_queue_add(struct tevent_queue *queue,
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| 334 | struct tevent_context *ev,
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| 335 | struct tevent_req *req,
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| 336 | tevent_queue_trigger_fn_t trigger,
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| 337 | void *private_data);
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| 338 | void tevent_queue_start(struct tevent_queue *queue);
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| 339 | void tevent_queue_stop(struct tevent_queue *queue);
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| 340 |
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| 341 | size_t tevent_queue_length(struct tevent_queue *queue);
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| 342 |
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| 343 | typedef int (*tevent_nesting_hook)(struct tevent_context *ev,
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| 344 | void *private_data,
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| 345 | uint32_t level,
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| 346 | bool begin,
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| 347 | void *stack_ptr,
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| 348 | const char *location);
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| 349 | #ifdef TEVENT_DEPRECATED
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| 350 | #ifndef _DEPRECATED_
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| 351 | #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
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| 352 | #define _DEPRECATED_ __attribute__ ((deprecated))
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| 353 | #else
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| 354 | #define _DEPRECATED_
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| 355 | #endif
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| 356 | #endif
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| 357 | void tevent_loop_allow_nesting(struct tevent_context *ev) _DEPRECATED_;
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| 358 | void tevent_loop_set_nesting_hook(struct tevent_context *ev,
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| 359 | tevent_nesting_hook hook,
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| 360 | void *private_data) _DEPRECATED_;
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| 361 | int _tevent_loop_until(struct tevent_context *ev,
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| 362 | bool (*finished)(void *private_data),
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| 363 | void *private_data,
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| 364 | const char *location) _DEPRECATED_;
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| 365 | #define tevent_loop_until(ev, finished, private_data) \
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| 366 | _tevent_loop_until(ev, finished, private_data, __location__)
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| 367 | #endif
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| 368 |
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| 369 |
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| 370 | /**
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| 371 | * The following structure and registration functions are exclusively
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| 372 | * needed for people writing and pluggin a different event engine.
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| 373 | * There is nothing useful for normal tevent user in here.
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| 374 | */
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| 375 |
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| 376 | struct tevent_ops {
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| 377 | /* context init */
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| 378 | int (*context_init)(struct tevent_context *ev);
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| 379 |
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| 380 | /* fd_event functions */
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| 381 | struct tevent_fd *(*add_fd)(struct tevent_context *ev,
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| 382 | TALLOC_CTX *mem_ctx,
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| 383 | int fd, uint16_t flags,
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| 384 | tevent_fd_handler_t handler,
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| 385 | void *private_data,
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| 386 | const char *handler_name,
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| 387 | const char *location);
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| 388 | void (*set_fd_close_fn)(struct tevent_fd *fde,
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| 389 | tevent_fd_close_fn_t close_fn);
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| 390 | uint16_t (*get_fd_flags)(struct tevent_fd *fde);
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| 391 | void (*set_fd_flags)(struct tevent_fd *fde, uint16_t flags);
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| 392 |
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| 393 | /* timed_event functions */
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| 394 | struct tevent_timer *(*add_timer)(struct tevent_context *ev,
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| 395 | TALLOC_CTX *mem_ctx,
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| 396 | struct timeval next_event,
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| 397 | tevent_timer_handler_t handler,
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| 398 | void *private_data,
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| 399 | const char *handler_name,
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| 400 | const char *location);
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| 401 |
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| 402 | /* immediate event functions */
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| 403 | void (*schedule_immediate)(struct tevent_immediate *im,
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| 404 | struct tevent_context *ev,
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| 405 | tevent_immediate_handler_t handler,
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| 406 | void *private_data,
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| 407 | const char *handler_name,
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| 408 | const char *location);
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| 409 |
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| 410 | /* signal functions */
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| 411 | struct tevent_signal *(*add_signal)(struct tevent_context *ev,
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| 412 | TALLOC_CTX *mem_ctx,
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| 413 | int signum, int sa_flags,
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| 414 | tevent_signal_handler_t handler,
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| 415 | void *private_data,
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| 416 | const char *handler_name,
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| 417 | const char *location);
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| 418 |
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| 419 | /* loop functions */
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| 420 | int (*loop_once)(struct tevent_context *ev, const char *location);
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| 421 | int (*loop_wait)(struct tevent_context *ev, const char *location);
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| 422 | };
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| 423 |
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| 424 | bool tevent_register_backend(const char *name, const struct tevent_ops *ops);
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| 425 |
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| 426 |
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| 427 | /**
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| 428 | * The following definitions are usueful only for compatibility with the
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| 429 | * implementation originally developed within the samba4 code and will be
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| 430 | * soon removed. Please NEVER use in new code.
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| 431 | */
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| 432 |
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| 433 | #ifdef TEVENT_COMPAT_DEFINES
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| 434 |
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| 435 | #define event_context tevent_context
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| 436 | #define event_ops tevent_ops
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| 437 | #define fd_event tevent_fd
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| 438 | #define timed_event tevent_timer
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| 439 | #define signal_event tevent_signal
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| 440 |
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| 441 | #define event_fd_handler_t tevent_fd_handler_t
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| 442 | #define event_timed_handler_t tevent_timer_handler_t
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| 443 | #define event_signal_handler_t tevent_signal_handler_t
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| 444 |
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| 445 | #define event_context_init(mem_ctx) \
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| 446 | tevent_context_init(mem_ctx)
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| 447 |
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| 448 | #define event_context_init_byname(mem_ctx, name) \
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| 449 | tevent_context_init_byname(mem_ctx, name)
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| 450 |
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| 451 | #define event_backend_list(mem_ctx) \
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| 452 | tevent_backend_list(mem_ctx)
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| 453 |
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| 454 | #define event_set_default_backend(backend) \
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| 455 | tevent_set_default_backend(backend)
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| 456 |
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| 457 | #define event_add_fd(ev, mem_ctx, fd, flags, handler, private_data) \
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| 458 | tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data)
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| 459 |
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| 460 | #define event_add_timed(ev, mem_ctx, next_event, handler, private_data) \
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| 461 | tevent_add_timer(ev, mem_ctx, next_event, handler, private_data)
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| 462 |
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| 463 | #define event_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data) \
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| 464 | tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data)
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| 465 |
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| 466 | #define event_loop_once(ev) \
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| 467 | tevent_loop_once(ev)
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| 468 |
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| 469 | #define event_loop_wait(ev) \
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| 470 | tevent_loop_wait(ev)
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| 471 |
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| 472 | #define event_get_fd_flags(fde) \
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| 473 | tevent_fd_get_flags(fde)
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| 474 |
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| 475 | #define event_set_fd_flags(fde, flags) \
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| 476 | tevent_fd_set_flags(fde, flags)
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| 477 |
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| 478 | #define EVENT_FD_READ TEVENT_FD_READ
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| 479 | #define EVENT_FD_WRITE TEVENT_FD_WRITE
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| 480 |
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| 481 | #define EVENT_FD_WRITEABLE(fde) \
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| 482 | TEVENT_FD_WRITEABLE(fde)
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| 483 |
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| 484 | #define EVENT_FD_READABLE(fde) \
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| 485 | TEVENT_FD_READABLE(fde)
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| 486 |
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| 487 | #define EVENT_FD_NOT_WRITEABLE(fde) \
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| 488 | TEVENT_FD_NOT_WRITEABLE(fde)
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| 489 |
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|---|
| 490 | #define EVENT_FD_NOT_READABLE(fde) \
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| 491 | TEVENT_FD_NOT_READABLE(fde)
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| 492 |
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|---|
| 493 | #define ev_debug_level tevent_debug_level
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|---|
| 494 |
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|---|
| 495 | #define EV_DEBUG_FATAL TEVENT_DEBUG_FATAL
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|---|
| 496 | #define EV_DEBUG_ERROR TEVENT_DEBUG_ERROR
|
|---|
| 497 | #define EV_DEBUG_WARNING TEVENT_DEBUG_WARNING
|
|---|
| 498 | #define EV_DEBUG_TRACE TEVENT_DEBUG_TRACE
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|---|
| 499 |
|
|---|
| 500 | #define ev_set_debug(ev, debug, context) \
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|---|
| 501 | tevent_set_debug(ev, debug, context)
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|---|
| 502 |
|
|---|
| 503 | #define ev_set_debug_stderr(_ev) tevent_set_debug_stderr(ev)
|
|---|
| 504 |
|
|---|
| 505 | #endif /* TEVENT_COMPAT_DEFINES */
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|---|
| 506 |
|
|---|
| 507 | #endif /* __TEVENT_H__ */
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